Basically it doesn't produce heat by converting energy into heat, rather, it uses energy to move heat from one place to another. Hence the name heat pump - it literally just pumps heat around. The place where it gets the heat in this case is the outside. While it's usually colder than inside at the times when you'd want to use a heat pump for heating, it's still way more than absolute zero - the freezing point of water is 273 Kelvin, after all. This means there's always some amount of heat that you can 'steal' from the outside and pump indoors.
You may infer that this means that the heat pump is going to be pumping colder air outside, and you'd be correct in that inference. What's even more interesting is the realization that you can harness that property by running the heat pump 'in reverse' to cool a space - which is exactly what an air conditioner does. It's merely a heat pump that pumps the heat out of a space.
I like the progression. It's cool to see the numbers go up
Cycling
It literally just makes me feel like a kid again, just flying around at quite high speeds. I've recently discovered that this is also a lot of fun to do with friends
Walking
This is the one that helped me the furthest in weight loss back when I was overweight. You can do basically unlimited amounts of it, and with a podcast or audiobook in your headphones, it doesn't really get boring either.
Seems like this should be called some variation of "raw"